- 6175841809
- hersratingcompany@gmail.com
- 12 Pond St Ashland, MA 01721 United States
- 573 Washington St Quincy, MA 02169 United States
Certified HERS Rater serving Barnstable, Massachusetts — the largest town on Barnstable, helping builders, developers & homeowners meet the Massachusetts Stretch Energy Code and qualify for Mass Save incentives.
Get a Free QuoteCall 617-584-1809Barnstable enforces the Massachusetts Stretch Energy Code (225 CMR 22), adopted effective 7/1/2026. Under the 2025 code update (current for 2026 permits), new homes in Barnstable must reach a maximum HERS Index of 42 (mixed-fuel) or 45 (all-electric) — up to 48 with qualifying credits — verified by a RESNET-certified HERS rater. ADUs must meet HERS 52–58, and major alterations, additions or change-of-use projects HERS 65–75, depending on fuel type and on-site solar.
Related Barnstable services: Blower Door Testing Barnstable · Duct Leakage Testing Barnstable · Stretch Code Compliance Barnstable · MA Energy Codes Guide — or get a free quote from our RESNET-certified team (617-584-1809).
Sources: 2025 DOER Massachusetts Stretch & Specialized Codes Technical Guidance (Sept 2025); Mass.gov Building Energy Code Adoption by Municipality (June 2026); Mass Save 2026 Residential New Construction program.
Yes. Barnstable has enforced the Massachusetts Stretch Energy Code since 7/1/2026, so new dwellings need a certified HERS rating from a RESNET-accredited rater — with blower door and duct leakage testing — before the certificate of occupancy.
Homes permitted in Barnstable today must score HERS 42 or lower (mixed-fuel) or HERS 45 or lower (all-electric), up to 48 with qualifying credits. ADUs fall in the HERS 52–58 range and major alterations/additions in the 65–75 range, depending on fuel type and on-site solar.
Barnstable is one of 242 of Massachusetts’ 351 municipalities enforcing the Stretch Energy Code (225 CMR 22) per the June 2026 Mass.gov adoption list; 60 towns have gone further to the Specialized Code and 49 remain on the Base Code.
These are the official maximum HERS Index scores that apply to projects in Barnstable under Table R406.5 of the current code (2025 DOER Technical Guidance):
| Building type | New construction (permits after 7/1/2024) | New construction w/ embodied-carbon credit (R406.5.2) | Accessory Dwelling Units | Major alterations, additions, change of use |
|---|---|---|---|---|
| Mixed-fuel building | 42 | 45 | 52 | 65 |
| Mixed-fuel + solar electric | 42 | 45 | 55 | 70 |
| All-electric building | 45 | 48 | 55 | 70 |
| All-electric + solar electric | 45 | 48 | 58 | 75 |
Scores are measured before counting on-site renewable generation (per R406.5). Historic buildings may opt out for alterations under R503.1.1. Embodied-carbon credits (+3 points) come from low-GWP concrete and insulation EPDs per Table R406.5.3/R406.5.4.
Beyond the HERS maximums above, every new dwelling in Barnstable on the HERS pathway must satisfy four code sections — R403.6 (Ventilation), R404.4 (EV Ready), R406 (HERS) and Appendix RB (Solar Ready) — per the 2025 DOER Technical Guidance:
Passive House alternative (R405): Phius or PHI certification satisfies the code in Barnstable in place of a HERS score — with a Certified Passive House Consultant for design and a Phius Certified Verifier/Rater during construction — and still requires EV-Ready and Solar-Ready compliance. Prescriptive path: allowed only for buildings without individually separate dwelling units, additions, and alterations — and a whole-building prescriptive project must implement 2 of the 3 additional-efficiency packages in R408 (enhanced envelope, higher-efficiency HVAC, or reduced water-heating energy). Additions of 1,000 sq ft or more (or exceeding 100% of the existing floor area) must meet both R502.3 prescriptive and the R406.5 HERS limits. Level III alterations (work area over 50% of the home and over 1,000 sq ft) also trigger HERS compliance; historic buildings are exempt under R501.6. Note that ENERGY STAR® is no longer a compliance path — HERS and Passive House are the two certification routes in Barnstable.
Detail sourced from the 2025 Massachusetts Stretch & Specialized Codes Technical Guidance (DOER, Sept 2025), Table R406.5 and Appendix RC.
HERS Rating Company provides certified HERS Index ratings in Barnstable, Massachusetts. Barnstable, the Cape’s largest town, stretches from Cape Cod Bay to Nantucket Sound and is famous for the historic homes lining Route 6A and its many 18th- and 19th-century sea captains’ houses. Incorporated in 1639, it blends antique homes with year-round neighborhoods and new construction. In climate zone 5A, our RESNET-accredited raters deliver fast, accurate energy ratings that keep your project on schedule and in full compliance with Massachusetts energy codes.
Whether restoring a Route 6A antique or building new in one of Barnstable’s seven villages, our certified HERS raters provide all documentation the local building department needs for permits and final inspections.
The MA Stretch Energy Code requires all new residential construction to be verified by a certified HERS rater. Builders in Barnstable must meet IECC 2021 requirements including air tightness tested by blower door and duct leakage verified by duct leakage testing. We provide all documentation required by the Barnstable building department.
Ready to schedule your HERS rating in Barnstable? Get a fast, free quote today.
Schedule Your HERS RatingCall 617-584-1809HERS Rating costs in Barnstable typically depend on home size, design complexity, and the number of required site visits. For an accurate quote tailored to your Barnstable project, call our RESNET-certified team at 617-584-1809.
Yes. New residential construction in Barnstable, MA must demonstrate energy-code compliance, and a HERS Rating is the standard path under the Massachusetts Stretch Code. Call 617-584-1809 to confirm requirements for your build.
A HERS Rating in Barnstable generally involves plan review, a mid-construction inspection, and a final test with blower door and duct testing. Timing depends on your construction schedule. Reach us at 617-584-1809 to coordinate.
The Massachusetts Stretch Code sets maximum HERS index targets that vary by code version and home type, with lower scores indicating greater efficiency. Our Barnstable raters help you hit the required score—call 617-584-1809.
At HERS Rating Company, we are committed to providing the highest quality energy consulting services to homebuilders, architects, and developers across Massachusetts.
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12 Pond St Ashland, MA 01721 United States
573 Washington St Quincy, MA 02169 United States
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